While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the facility server via the network Multicom.Net. The developers of the given facilities very often face with such a necessity. For instance, during the debugging in a remote machine or when different people with the help of different machines (which are nevertheless connected to one machine) maintain the same facilities. Multicom.Net is designed especially for the solving of these problems. The use of our product gives you the possibility to give the remote access to serial port via TCP/IP. The product consists of three parts: 1.Multicom.Net is a program emulator of serial ports (up to 255) for operational system W2K/XP. 2.Multicom.Net client is the service, which realizes the exchange between Multicom.Net and TCP/IP. 3. Multicom.Net server is a service which realizes the exchange between a real driver of the serial port and TCP/IP. Multicom. client and server handle two flows: outcoming and incoming. The client takes the bytes that were transferred to all the virtual ports earlier and then transfers them to the server, which was started up on the other computer. Also the client receives flows from the server and gives the bytes to Multicom.Net. With Multicom.net -Optimize network data flow between computer & data terminal. -Split serial output between different clients. -Provide additional control through serial stream.